1CALOGERO F. Why are certain nonlinear PDEs both widely applicable and integrable, in "What is inte- grability!"[M]. Berlin: Springer-Verlag, 1989: 1-62.
2HAAR A. Uber adjungierte variations probleme und adjungierte extremal fiachen[J]. Math Ann 1928, 100" 481-502.
3CLARKSON P At FOKAS A S, ABLOWITZ M J. Hodograph transformations of linearizable partial differential equations[J]. SIAM J Appl Math, 1989, 49(4): 1 188-1209.
4EULER M, EULER N, PETERSSO N. Linearizable hierarchies of evolution equations in (1+1) dimen- sions[J]. Stud Appl Math, 2003, 111(3): 315-337.
5KANG Jing, Qu Chang-zheng. Hodograph-type transformations for linearization of systems of non-linear diffusion equations[J]. Stud Appl Math, 2010, 124(3): 247-282.
7PARKER A. On the Camassa-Holm equation and a direct method of solution I : bilinear form and solitary waves[J]. R Soc Lond Proc Ser A, 2004,460(2 050): 2 929-2 957.
8MATSUNO Y. Multisoliton solutions of the Degasperis-Procesi equation and the peakon limit[J]1. Inv Prob, 2005, 21(5)" 1 553-1570.
9CRADDOCK M, PLATEN E. Symmetry group meth- ods for fundamental solutions[J]. J Differential Equations, 2004~ 207(2)" 285-302.
10KANG Jing, Qu Chang-zheng. Symmetry groups and fundamental solutions for systems of parabolic equations[DB/OL], http://www.wipm.cas.cn/iwnmp /sxhy2011/hyrc2011/201107/P0201107213376389499 61.doc[2011-7-21].